The Use of JTable in Swing

Abhishek Dubey
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This article describes Java Swing and makes a frame containing three labels, three text fields and two buttons. When you enter the data and click on the add button, then click on the show button then a new frame is opened and the frame contains a table. And the table has three fields named Name, Roll No and Marks for better understanding.

Step 1: import necessary packages

import javax.swing.*;// for uesing the swing coponet like JButton,JTextField JScrollPane etc
import java.awt.event.*;//for performing event handling
import javax.swing.table.*;// for creating a DefaultTableModel

Step 2: Define the data members of componets to be used

       JFrame fr1,fr2;
       JScrollPane sb;
       JTextField tfName,tfRollNo,tfMark;
       JButton bAdd,bShow;
       JTable tb;
       DefaultTableModel model;
       JLabel jl1,jl2,jl3,jl4;

Step 3: Create a frames object and set the layout to null.

fr1=new JFrame();
fr2=new JFrame();
fr1.setLayout(null);
fr2.setLayout(null);

Step 4: Create the Labels, Buttons and TextFields objects and call setBounds for them to set the position in
the frame.

jl1=new JLabel("Ente Name");
jl2=new JLabel("Ente Roll No");
jl3=new JLabel("Ente Mark");
jl4=new JLabel("Your Data in Table Format");
jl1.setBounds(30,50,100,40);
jl2.setBounds(30,120,100,40);
jl3.setBounds(30,190,100,40);
jl4.setBounds(60,30,200,20);
tfName=new JTextField();
tfRollNo=new JTextField();
tfMark=new JTextField();
tfName.setBounds(250,50,100,40);
tfRollNo.setBounds(250,120,100,40);
tfMark.setBounds(250,190,100,40);
bAdd=new JButton("ADD");
bShow=new JButton("Show");
bAdd.setBounds(10,270,100,50);
bShow.setBounds(180,270,100,50);
tb=new JTable();
sb=new JScrollPane(tb);
sb.setBounds(30,60,150,100);

step 5: Add the component to the appropriate frame.

fr1.add(tfName);

fr1.add(tfRollNo);
fr1.add(tfMark);

fr1.add(bAdd);

fr1.add(bShow);

fr1.add(jl1);

fr1.add(jl2);

fr1.add(jl3);

fr2.add(jl4);

fr2.add(sb);

Step 6: Attach the button to an appropriate Listener (that is called registration to source) and set the frame size.

bAdd.addActionListener(this);
bShow.addActionListener(this);
fr1.setSize(400,400);
fr2.setSize(300,300);
fr1.setVisible(true);

Step 7: Create the object DefaultTableModel and add the column with their name. And set the table model.

model=new DefaultTableModel();
model.addColumn("Name");

model.addColumn("RollNo");

model.addColumn("Mark");
tb.setModel(model);

Step 8: Write the code for the actionPerformed Method.

public void actionPerformed(ActionEvent ae)

{
if(ae.getSource()==bAdd)

{

String r[]=new String[5];

r[0]=tfName.getText();

r[1]=tfRollNo.getText();

r[2]=tfMark.getText();

tfName.setText("");

tfRollNo.setText("");

tfMark.setText("");

model.addRow(r);

}

if (ae.getSource()==bShow)

{
fr2.setVisible(true);

}

}

Step 9: Rest only the Action performed method all the things write with in a constructor so we need only create the object of my class with the main method.

Complete code

import javax.swing.*;
import java.awt.event.*;
import javax.swing.table.*;
class JTableTest implements ActionListener
{
JFrame fr1,fr2;
JScrollPane sb;
JTextField tfName,tfRollNo,tfMark;
JButton bAdd,bShow;
JTable tb;
DefaultTableModel model;
JLabel jl1,jl2,jl3,jl4;
JTableTest()
{
fr1=new JFrame();
fr2=new JFrame();
fr1.setLayout(null);
fr2.setLayout(null);
jl1=new JLabel("Ente Name");
jl2=new JLabel("Ente Roll No");
jl3=new JLabel("Ente Mark");
jl4=new JLabel("Your Data in Table Format");
jl1.setBounds(30,50,100,40);
jl2.setBounds(30,120,100,40);
jl3.setBounds(30,190,100,40);
jl4.setBounds(60,30,200,20);
tfName=new JTextField();
tfRollNo=new JTextField();
tfMark=new JTextField();
tfName.setBounds(250,50,100,40);
tfRollNo.setBounds(250,120,100,40);
tfMark.setBounds(250,190,100,40);
bAdd=new JButton("ADD");
bShow=new JButton("Show");
bAdd.setBounds(10,270,100,50);
bShow.setBounds(180,270,100,50);
tb=new JTable();
sb=new JScrollPane(tb);
sb.setBounds(30,60,150,100);
fr1.add(tfName);
fr1.add(tfRollNo);
fr1.add(tfMark);
fr1.add(bAdd);
fr1.add(bShow);
fr1.add(jl1);
fr1.add(jl2);
fr1.add(jl3);
fr2.add(jl4);
fr2.add(sb);
bAdd.addActionListener(this);
bShow.addActionListener(this);
fr1.setSize(400,400);
fr2.setSize(300,300);
fr1.setVisible(true);
model=new DefaultTableModel();
model.addColumn("Name"):
model.addColumn("RollNo");
model.addColumn("Mark");
tb.setModel(model);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==bAdd)
{
String r[]=new String[5];
r[0]=tfName.getText();
r[1]=tfRollNo.getText();
r[2]=tfMark.getText();
tfName.setText("");
tfRollNo.setText("");
tfMark.setText("");
model.addRow(r);
}
if (ae.getSource()==bShow)
{
fr2.setVisible(true);
}
}
public static void main(String[] args)
{
new JTableTest();
}
}

Output

The blank form is opened at first.

This is the second form containing the table and it opens when the show button is clicked.

Now put the value in each text box and click the add button.